SU1662672A1 - Apparatus for conducting processes in spouting layer - Google Patents

Abstract

The invention can be used in the milk, food and chemical industries and allows to intensify heat exchange, reduce the hydraulic resistance at start-up and increase the reliability of the apparatus. In the apparatus, containing a chamber with loading and unloading devices and a gas distribution grid in the form of a set of parallel profile elements, equipped with distance stops, on which wedge-shaped nozzle elements are installed, and plates over each profile element. In this case, the plates are commensurate in height with the height of the layer and are made in the form of slot channels in pairs between themselves and with the side surfaces of the profile elements. The slotted channel between the tops of the plates expands upwards, and the plates are mounted so that they can be moved in height. 2 hp ff, 2 ill.

Description

The invention relates to the design of apparatus for drying dispersed materials in the flowing layer and can be used in the dairy, food, chemical and other industries.

The purpose of the invention is to intensify heat transfer, decrease hydraulic resistance at start-up and increase reliability of operation.

FIG. 1 schematically shows the proposed apparatus; in fig. 2 - a section - A-A in FIG. one.

The apparatus comprises a diffuser 1 with a fitting 2 for supplying the coolant to the chamber 3. comprising a device 4 for feeding material, a device 5 for unloading dried material and a fitting 6 for withdrawing the coolant. The diffuser 1 and the chamber 3 are attached to the frame 7 gas distribution

lattice. On the inner surface of the frame there are fixed profile elements 8, mounted in parallel and containing remote stops 9, on which the profile elements 10 are mounted. Above each profile element 10, plates 11 are installed with a height commensurate with the height of the flowing layer, made so that the lower and upper parts of them form, respectively, with the side surfaces of the profile elements and between each other slot channels. The slotted channel formed by the tops of the plates expands upwards. The plates 11 are mounted with the possibility of moving in height.

The device works as follows.

During the initial start-up, when there is no layer in the apparatus, dry dispersed material is loaded onto the grate. Through

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fitting 2 into the diffuser 1 serves coolant, which enters the gas distribution grid channels and flows out of them in the form of flat flows to the side surfaces of the profile elements 8, capturing particles of the layer material located at the base of the elements 10, and transporting them through the slotted channels. At the same time, the hydraulic resistance of the flowing layer increases from zero to the resistance of the flowing layer, and its peak is absent.

The material ejected by the coolant from the vertical slit channels to the surface under the force of gravity is lowered along the side surfaces of the elements 10 to their bases and again picked up by flat flows of the coolant, which is removed from the apparatus through the fitting 6.

The initial wet material is fed into the chamber 3 through the charging device 4, repeatedly passes through the flow zones (slotted channels), is heated by high-temperature heat carrier and cooled, and lowers to the base of the landing elements. As the particles circulate through the spouting zones and advance towards the discharge zone, they are dried. Dried to the desired humidity, the particles are discharged through the device 5.

Due to the presence of plates 11, the mixing of particles from the zone of descent is eliminated not only in the vertical slotted channel between their upper parts, but also in the slotted channels between the lower parts and lateral surfaces of the profile elements. Virtually all particles pass through the high-temperature heating zone. This makes it possible to intensify the heat exchange. In addition, the ingress of a high-temperature heat transfer medium to the zone of material descent is practically eliminated. Since the porosity of the material is high in the left-side channels between the plates (spouting zone), when the supply of coolant stops (stopping of the apparatus), the bed height

(fixed in them significantly (1.5-2 times) lower than the height of the fixed layer in the zone of descent. This provides a significant reduction in hydraulic

layer resistance when the device is started up and allows to reduce the rated power of the blower fan.

The absence of movable plate sections in the apparatus eliminates the need to transfer them to their original position, and then return to work and the need for partial unloading of part of the layer material and operator intervention, which increases the reliability of its work.

Expanding upward slotted channels between the tops of the plates make it possible to reduce the hydraulic resistance as the material moves along them. The possibility of moving the plates

Claims (1)

height allows changing the circulation ratio of the material through the flow zones and changing the drying mode. Invention Formula 1, Apparatus for carrying out processes in the flowing layer, containing a chamber with loading and unloading devices and gas distribution grid in the form of a set of parallel profile elements equipped with remote stops on which wedge-shaped nozzle elements are installed, and plates above each profile element, which is characterized by the fact that, in order to intensify heat exchange, decrease hydraulic resistance during start-up and increase reliability of operation, it is equipped with additional plates that are installed in pairs over each profile element and height comparable with the height of the layer with the formation of slotted channels between themselves and with the side surfaces of the profile elements. 2, the apparatus according to claim 1, characterized in that the slotted channel is made expanding upwards. 3, the apparatus according to claim 1, characterized in that the plates are mounted for movement in height. Aa